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>>>big outcry out west where an ancient
rock formation
was toppled by a pair of
boy scout
leaders in
utah
's
goblin valley state park
. caught on a
cell phone
camera, and a lot of people are wondering what they were thinking. nbc's miguel almaguer sat down with the men involved and has our report from
utah
.

>> reporter: utah
's
goblin valley state park
is a beauty only
mother nature
could create. wiggle it just a little bit

>> reporter: three men,
boy scout
leaders on a trip to the park, toppled a
rock formation
170 million years old in 14 seconds.

>>we have now modified
goblin valley
. a new
goblin valley
exists.

>> reporter: glenn taylor had his son by his side as he pushed the massive boulder off its mushroom oh like perch.
dave hall
took the video the first thing we say after the rock is on the ground is a little kid right here could have been killed by this rock falling on them. it's all about saving lives.

>>they posted their clip on youtube. now authorities say the three could be charged with felony vandalism.

>> reporter: this is a phenomenal piece of property people travel from all over the world to see. to have that kind of behavior going on was heartbreaking.

>>in hindsight the men say maybe they should have notified a
park ranger
. another lesson learned, they add, is maybe if you're going to
push over
a natural beauty don't record it and upload to
social media
. [ laughter ]

>> reporter: people will say you guys are
boy scout
leaders. you should know better.

>> reporter: the rock needed to come down. with the information we have today of course we would do it different.

>>tonight the
boy scouts of america
calls the behavior isolated and reprehensible and says it is investigating the matter. miguel almaguer, nbc news,
utah
.